Cataract is a condition which causes clouding of the clear lens in the eye and is one of the leading causes of vision impairment. Cataracts can be congenital yet more commonly occur with age as the focusing lens in the eye becomes progressively less clear, disrupting the flow of light through the eye and onto the retina. Cataracts are generally slowly progressive but certain types of cataracts can progress more quickly. Common symptoms of cataract include blurred vision, sensitivity to glare and distorted or double vision.